SMGR removing Aura Messaging mailbox on PW change

SMGR removing Aura Messaging mailbox on PW change

SMGR removing Aura Messaging mailbox on PW change

We have a customer that has an application that add's station and voicemail when a new user is added to the corp AD. ( From a DEV connect partner) Works fine. But in the app if we change the password it removes the voice-mailbox rather than change the password.

I can see that the command being sent to the SMGR is a change not a delete.

Anyone seen this ?

The complete XML is (stripped namespaces), it only a delta change on the messaging password: